CN113265924B - Construction method for using red bed mudstone blocks as high-fill dynamic compaction roadbed filling - Google Patents
Construction method for using red bed mudstone blocks as high-fill dynamic compaction roadbed filling Download PDFInfo
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C3/00—Foundations for pavings
- E01C3/04—Foundations produced by soil stabilisation
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- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/20—Securing of slopes or inclines
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/02—Improving by compacting
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- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
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Abstract
The invention belongs to the technical field of dynamic compaction construction of red bed mudstone high-fill roadbed. The invention mainly aims at the problem caused by using red layer mudstone as roadbed filling. Firstly, carrying out pre-disintegration treatment on red bed mudstone; secondly, tamping red-bed mudstone fillers by adopting dynamic compaction construction, and tamping the embankment by adopting a construction scheme of point tamping and full tamping, so that the compactness of the embankment fillers meets the corresponding construction requirement to reduce the water permeation; paving lime soil and sand on the upper surface layer of the embankment to serve as a waterproof cushion layer and tamping the waterproof cushion layer; after the roadbed is filled, treating the soil hydrophobizing agent on the surface of the roadbed slope, and preventing the red layer mudstone filler from absorbing natural rainfall by using the hydrophobic effect; a sandy water guide layer is continuously paved on the roadbed slope to avoid the earth surface precipitation from accumulating in gaps in the roadbed. The invention utilizes the dynamic compaction technology and the red mudstone pre-disintegration technology to ensure that the red mudstone roadbed has better compactness and stability, and is combined with the waterproof and drainage design to ensure the long-term safety and stability of the red mudstone roadbed.
Description
Technical Field
The invention relates to the technical field of dynamic compaction construction of red bed mudstone high-fill roadbed.
Background
The lithology of the red series is mainly sandstone, mudstone and siltstone, wherein the lithology is the most mudstone content and the largest proportion. The red mudstone has strong hydrophilicity and weak water permeability, can be softened and plastically deformed if fully contacted with water, and has the characteristics of weak weather resistance, low strength and the like.
When the material is used as roadbed filling, because the particles are easy to break, the uniaxial compressive strength is low, weathered products are easy to disintegrate and soften after meeting water, and the engineering stability is poor, serious diseases such as roadbed sinking, cutting collapse, pavement cracking and the like are easy to occur when the material is directly used as the roadbed filling. For example: the mudstone subgrade of the Lanzhou to gulf section of sea stone of the G6 Kyowa highway has large-area subgrade settlement diseases, the local settlement is close to 2m, the problems of road surface distortion, road surface unevenness and the like are caused, the safety and the comfort of driving are seriously influenced, and the maintenance cost is increased. The problem of engineering quality deterioration is easy to occur under the conditions of heavy rain, unsmooth drainage and the like. Therefore, it should not be used as a base road base filler. However, for the red layer belly region, the roadbed filling material source shortage and economic cost problems are considered, and local materials tend to be used.
Aiming at the problem caused by red bed mudstone as roadbed filling, a plurality of scholars carry out a large amount of indoor tests and field geological surveys, and the red bed mudstone blocks can be used as high-filling dynamic compaction roadbed filling. However, at present, the research on the complete construction technology of red bed mudstone filled roadbed is less, the current roadbed filling mainly adopts the construction mode of layered filling and multi-layer tamping or rolling, the water-proof and drainage treatment mainly adopts the traditional road surface layer foamed asphalt water-proof combined gravel layer drainage, the construction process is complex, and the efficiency is lower. A complete construction technical scheme is not provided aiming at a construction mode of treating the high-fill red-bed mudstone roadbed by dynamic compaction and combining a water-proof design of the high-fill red-bed mudstone roadbed. .
Disclosure of Invention
The invention aims to provide a construction method for using red bed mudstone blocks as a high-fill dynamic compaction roadbed filling material, which has the advantages of good waterproof and drainage performance, convenience in construction, good stability and safety and solves the problems in the prior art.
In order to achieve the purpose, the invention provides the following technical scheme:
the method comprises the following steps:
s1, pre-disintegrating red layer mudstone, exposing the blasted red sandstone filler in the atmosphere, sunlight and rainwater without covering, wherein the total days of the pre-disintegrating treatment is 8-15 days.
Under the action of these natural factors, red mudstone is decomposed quickly by weathering, its strength is reduced quickly and its activity is eliminated quickly.
S2, the red sandstone filler after pre-disintegration treatment can be transported to a embankment for filling, and then strong ramming treatment is carried out, wherein point ramming is carried out twice, and full ramming is carried out once.
The processing mode of the step tamps the embankment filler, accelerates the drainage and consolidation of the filler and increases the compactness.
S3, paving a lime-soil cushion layer, uniformly paving the mixed lime-soil with the block diameter smaller than 15mm on the top surface of the embankment, paving the lime-soil cushion layer with the thickness smaller than 200mm, and tamping the mixed lime-soil cushion layer by using a road roller or a frog hammer.
This step prevents groundwater from infiltrating the subgrade by capillary action.
S4, paving a sandy drainage layer on the lime cushion layer, gradually reducing sand grains from bottom to top, covering the sandy layer with a small amount of pre-disintegrated red mudstone, flattening by using a bulldozer, and tamping the pre-disintegrated red mudstone by using a dynamic compactor.
Make red layer mudstone filler particles's pore water discharge along sandy drainage bed seepage downwards through ramming, filler drainage consolidation process with higher speed, the soil particle receives the weak water film attenuation that combines in extrusion soil particle surface, and inside microstructure is more closely knit.
S5, after filling of the roadbed, spraying a soil hydrophobing agent on the roadbed side slope and the roadbed top surface, mixing and paving the water-based environment-friendly soil surface hydrophobing agent and red layer mudstone on the roadbed top surface and the roadbed side slope surface, and leveling the soil surface sprayed with the hydrophobing agent by using a road roller or a land leveler.
And S6, laying geogrids on the road side slope, and fixing the geogrids on the side slope.
The geogrid and the soil hydrophobing agent jointly form a combined waterproof layer to prevent surface rainfall from permeating into the red layer mudstone roadbed.
S7, paving a sandy drainage layer on the side slope geogrid to extend to a sandy drainage layer at the lower part of the roadbed, wherein the sandy drainage layer is gradually thinned from inside to outside, covers the grouted rubble and extends to the sandy drainage layer at the bottom of the roadbed, a water collecting pipe is arranged outside the sandy drainage layer at the bottom of the roadbed, dry rubble is paved on the water collecting pipe, and the water collecting pipe is provided with a hydrophobic plate, anti-filtration geotextile and an anti-countercurrent pressure valve;
s8, arranging a drainage ditch at the part of the external embankment lower than the road bed elevation. Natural rainfall is converged into the drainage ditch of the embankment through the pavement side ditch, so that the rainfall is prevented from permeating into the roadbed. The side slope of the roadbed and the sand drainage layer at the lower part of the roadbed can also drain a small amount of seepage water in the roadbed into the water collecting pipe and the drainage ditch.
Preferably, the method for judging whether the red layer mudstone is disintegrated in the step S1 is that a large newly disintegrated redsand rock block with the grain diameter of 50-70 cm is subjected to pre-disintegration treatment for several days, a large number of cracks appear on the surface, most of broken rocks are disintegrated, and when the large rock block is pushed by a sole, the large rock block is disintegrated into a broken rock pile, namely, the disintegration treatment of the redsand rock is considered to be finished.
Preferably, in step S1, the watering is performed once a day when the temperature is higher than 30 ℃ in sunny days, and the watering is performed once every other day when the temperature is lower than 30 ℃ in sunny days.
Preferably, a composite geomembrane layer is laid on the lime-soil cushion layer in the step S3.
Preferably, the grouted rubble in step S7 may be replaced by burying a concrete frame revetment with a drainage groove.
Preferably, the watering in step S1 is performed to such an extent that the rock surface is completely covered with water.
Preferably, the collector pipe is provided with a hydrophobic plate, reversed filter geotechnical cloth and a countercurrent-proof pressure valve, the hydrophobic plate is arranged at the top of the collector pipe and distributed in an inverted V shape to collect flowing water, and the reversed filter geotechnical cloth is distributed between the hydrophobic plate and the collector pipe.
The collector pipe is through hydrophobic board and anti-geotechnological cloth of straining guarantee that the infiltration flows in the collector pipe smoothly and can not appear blockking up or the condition of overflow, and the pressure valve of preventing flowing backwards can guarantee that outside drainage can not flow backwards and get into the collector pipe and cause reverse seepage flow and drainage difficulty.
Compared with the prior art, the invention has the following beneficial effects:
(1) and the cost is saved. The construction method for using red bed mudstone blocks as the high-fill dynamic compaction roadbed filler adopts the pre-disintegration technology and the dynamic compaction means to avoid multiple filling and rolling construction steps, reduces the manpower and mechanical cost generated by multiple ramming and filling and paving construction, greatly reduces the construction time and improves the construction efficiency.
(2) The stability is good. The red bed mudstone pre-disintegration technology and the dynamic compaction technology provided by the patent are combined, a large block of red bed mudstone is disintegrated into a soil body through a small amount of water spraying, the soil body is favorable for being effectively tamped into a compact soil body, the drainage and consolidation are accelerated by utilizing load under the action of the dynamic compaction, and the compactness and the bearing capacity of the red bed mudstone roadbed are obviously improved.
(3) The construction is convenient. The high fill dynamic compaction technology used by the patent does not need repeated filling construction for many times, reduces construction steps, avoids repeated filling construction of personnel and mechanical multi-layer roadbeds, simplifies construction operation steps, and can quickly finish filling operation to avoid mutual interference caused by multi-shift group staggered construction.
(4) Is safe and reliable. Compare with the waterproof design of roadbed row now, the soil hydrophobe that this patent provided combines the design of sandy water guide layer, utilizes the soil hydrophobe to block the water guide and the anti-infiltration effect of a small amount of rainwater combination sandy water guide layer of rubble bank protection infiltration in time to dredge the roadbed infiltration, can avoid ground precipitation and groundwater infiltration roadbed to cause the unstable landslide of roadbed. Meanwhile, the geogrid construction ensures the combination of the long-term stability of the sand water-proof and drainage design and the roadbed side slope, and the roadbed is comprehensively maintained to be stable for a long time through an effective water-proof and drainage system.
Drawings
Fig. 1 is a flow chart of the scheme of the comprehensive water-proofing and drainage system of the roadbed.
Fig. 2 is a schematic structural view of a roadbed construction cross section.
Fig. 3 is a schematic view of a roadbed slope waterproof and drainage structure layer.
Fig. 4 is a schematic view of a roadbed slope drain pipe structure.
In the figure, 1-pavement, 2-embankment, 3-roadbed, 31-soil hydrophobic layer, 32-geogrid, 33-coarse sand layer, 34-fine sand layer, 35-grouted stone sheet, 36-dry masonry sheet, 41-water collecting pipe, 42-countercurrent-preventing pressure valve, 43-drainage pipe, 44-reversed-filtering geotextile, 45-hydrophobic plate, 46-impermeable geotextile, 5-drainage ditch, 6-ground, 7-mixed lime soil layer, 71-coarse sand layer and 72-fine sand layer.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
Example 1:
referring to figures 1 through 4 of the drawings,
a construction method for using red bed mudstone blocks as high-fill dynamic compaction roadbed filling,
the method comprises the following steps:
s1, pre-disintegrating red layer mudstone, exposing the blasted red sandstone filler in the atmosphere, sunlight and rainwater without covering, wherein the total days of the pre-disintegrating treatment is 8-15 days.
Under the action of these natural factors, red mudstone is decomposed quickly by weathering, its strength is reduced quickly and its activity is eliminated quickly.
S2, the red sandstone filler after pre-disintegration treatment can be transported to a embankment for filling, and then strong ramming treatment is carried out, wherein point ramming is carried out twice, and full ramming is carried out once.
The processing mode of the step tamps the embankment filler, accelerates the drainage and consolidation of the filler and increases the compactness.
S3, paving a lime-soil cushion layer, uniformly paving the mixed lime-soil with the block diameter smaller than 15mm on the top surface of the embankment, paving the lime-soil cushion layer with the thickness smaller than 200mm, and tamping the mixed lime-soil cushion layer by using a road roller or a frog hammer.
This step prevents groundwater from infiltrating the subgrade by capillary action.
S4, paving a sandy drainage layer on the lime cushion layer, gradually reducing sand grains from bottom to top, covering the sandy layer with a small amount of pre-disintegrated red mudstone, rolling by a road roller, and tamping the pre-disintegrated red mudstone by a dynamic compactor.
Make red layer mudstone filler particles's pore water discharge along sandy drainage bed seepage downwards through ramming, filler drainage consolidation process with higher speed, the soil particle receives the weak water film attenuation that combines in extrusion soil particle surface, and inside microstructure is more closely knit.
S5, after filling of the roadbed, spraying a soil hydrophobing agent on the roadbed side slope and the roadbed top surface, mixing and paving the water-based environment-friendly soil surface hydrophobing agent and red layer mudstone on the roadbed top surface and the side slope surface, and leveling the soil surface sprayed with the hydrophobing agent by using a road roller and a land leveler.
And S6, laying geogrids on the road side slope, and fixing the geogrids on the side slope.
The geogrid and the soil hydrophobing agent jointly form a combined waterproof layer to prevent surface precipitation from permeating into the red-layer mudstone roadbed.
S7, paving a sandy drainage layer on the side slope geogrid to extend to a sandy drainage layer at the lower part of the roadbed, wherein the sandy drainage layer is gradually thinned from inside to outside, covers the grouted rubble and extends to the sandy drainage layer at the bottom of the roadbed, a water collecting pipe is arranged outside the sandy drainage layer at the bottom of the roadbed, dry rubble is paved on the water collecting pipe, and the water collecting pipe is provided with a hydrophobic plate, anti-filtration geotextile and an anti-countercurrent pressure valve;
and S8, arranging a drainage ditch at the part of the external embankment lower than the level of the roadbed. And natural rainfall is converged into the embankment drainage ditch through the pavement side ditch, so that the rainfall is prevented from permeating into the roadbed. The side slope of the roadbed and the sand drainage layer at the lower part of the roadbed can also drain a small amount of seepage water in the roadbed into the water collecting pipe and the drainage ditch.
Example 2:
referring to fig. 1 to 4 of the drawings,
a construction method for using red bed mudstone blocks as high-fill dynamic compaction roadbed filling,
the method comprises the following steps:
s1, pre-disintegrating red-layer mudstone, exposing the blasted red sandstone filler in the atmosphere, sunlight and rainwater without covering, watering once a day when the highest temperature of the sunny weather is higher than 30 ℃, watering once every other day when the highest temperature of the sunny weather is lower than 30 ℃, and pre-disintegrating for 8-15 days. The method for judging whether the red layer mudstone is disintegrated is to disintegrate the red sandstone blocks newly by large blocks with the grain diameter of 50-70 cm, after a plurality of days of pre-disintegration treatment, a large number of cracks appear on the surface and most of broken rocks are disintegrated, and when the large blocks are pushed by soles, the large blocks are disintegrated into broken rock piles, namely the disintegration treatment of the red sandstone is considered to be finished.
Under the action of these natural factors, red mudstone is decomposed quickly by weathering, its strength is reduced quickly and its activity is eliminated quickly.
S2, the red sandstone filler after the pre-disintegration treatment can be transported to a embankment for filling, then the dynamic compaction treatment is carried out, the dynamic compaction is firstly carried out for two times, and then the dynamic compaction is carried out for one time.
The processing mode of the step tamps the embankment filler, accelerates the drainage and consolidation of the filler and increases the compactness.
S3, paving a lime-soil cushion layer, uniformly paving the mixed lime-soil with the block diameter smaller than 15mm on the top surface of the embankment, paving the lime-soil cushion layer with the thickness smaller than 200mm, and tamping the mixed lime-soil cushion layer by using a road roller or a frog tamper.
This step prevents groundwater from infiltrating the subgrade by capillary action.
S4, paving a sandy drainage layer on the lime cushion layer, gradually reducing sand grains from bottom to top, covering the sandy layer with a small amount of pre-disintegrated red mudstone, rolling by a road roller, and tamping the pre-disintegrated red mudstone by a dynamic compactor.
Make red layer mudstone filler particles's pore water discharge along sandy drainage bed seepage downwards through ramming, filler drainage consolidation process with higher speed, the soil particle receives the weak water film attenuation that combines in extrusion soil particle surface, and inside microstructure is more closely knit.
S5, after filling of the roadbed, spraying a soil hydrophobing agent on the roadbed side slope and the roadbed top surface, mixing and paving the water-based environment-friendly soil surface hydrophobing agent and red layer mudstone on the roadbed top surface and the roadbed side slope surface, and leveling the soil surface sprayed with the hydrophobing agent by using a road roller or a land leveler.
And S6, laying geogrids on the road side slope, and fixing the geogrids on the side slope.
The geogrid and the soil hydrophobing agent jointly form a combined waterproof layer to prevent surface rainfall from permeating into the red layer mudstone roadbed.
S7, paving a sandy drainage layer on the side slope geogrid to extend to a sandy drainage layer at the lower part of the roadbed, wherein the sandy drainage layer is gradually thinned from inside to outside, covers the grouted rubble and extends to the sandy drainage layer at the bottom of the roadbed, a water collecting pipe is arranged outside the sandy drainage layer at the bottom of the roadbed, dry rubble is paved on the water collecting pipe, and the water collecting pipe is provided with a hydrophobic plate, anti-filtration geotextile and an anti-countercurrent pressure valve;
and S8, arranging a drainage ditch at the part of the external embankment lower than the level of the roadbed. Natural rainfall is converged into the drainage ditch of the embankment through the pavement side ditch, so that the rainfall is prevented from permeating into the roadbed. The side slope of the roadbed and the sand drainage layer at the lower part of the roadbed can also drain a small amount of seepage water in the roadbed into the water collecting pipe and the drainage ditch.
Example 3:
referring to figures 1 through 4 of the drawings,
a construction method for using red bed mudstone blocks as high-fill dynamic compaction roadbed filling,
the method comprises the following steps:
s1, pre-disintegrating red-layer mudstone, exposing the blasted red sandstone filler in the atmosphere, sunlight and rainwater without covering, watering once a day when the highest temperature of the sunny weather is higher than 30 ℃, watering once every other day when the highest temperature of the sunny weather is lower than 30 ℃, and pre-disintegrating for 8-15 days. The method for judging whether the red layer mudstone is disintegrated is to disintegrate the red sandstone blocks newly by large blocks with the grain diameter of 50-70 cm, after a plurality of days of pre-disintegration treatment, a large number of cracks appear on the surface and most of broken rocks are disintegrated, and when the large blocks are pushed by soles, the large blocks are disintegrated into broken rock piles, namely the disintegration treatment of the red sandstone is considered to be finished.
Under the action of these natural factors, red mudstone is decomposed quickly by weathering, its strength is reduced quickly and its activity is eliminated quickly.
S2, the red sandstone filler after pre-disintegration treatment can be transported to a embankment for filling, and then strong ramming treatment is carried out, wherein point ramming is carried out twice, and full ramming is carried out once.
The processing mode of the step tamps the embankment filler, accelerates the drainage and consolidation of the filler and increases the compactness.
S3, paving a lime-soil cushion layer, uniformly paving the mixed lime-soil with the block diameter smaller than 15mm on the top surface of the embankment, paving a composite geomembrane layer on the lime-soil cushion layer, wherein the paving thickness is smaller than 200mm, and tamping the mixed lime-soil cushion layer by using a road roller or a frog hammer.
This step prevents groundwater from infiltrating the subgrade by capillary action.
S4, paving a sandy drainage layer on the lime cushion layer, gradually reducing sand grains from bottom to top, covering the sandy layer with a small amount of pre-disintegrated red mudstone, rolling by a road roller, and tamping the pre-disintegrated red mudstone by a dynamic compactor.
Make red bed mud rock filler particles's pore water discharge along sandy drainage bed seepage flow downwards through ramming, filler drainage consolidation process is accelerated, and the soil particles receive the weak water film attenuation that combines in extrusion soil particle surface, and inside microstructure is more closely knit.
S5, after filling of the roadbed, spraying a soil hydrophobing agent on the roadbed side slope and the roadbed top surface, mixing and paving the water-based environment-friendly soil surface hydrophobing agent and red layer mudstone on the roadbed top surface and the side slope surface, and leveling the soil surface sprayed with the hydrophobing agent by using a road roller and a land leveler.
And S6, laying geogrids on the road side slope, and fixing the geogrids on the side slope.
The geogrid and the soil hydrophobing agent jointly form a combined waterproof layer to prevent surface rainfall from permeating into the red layer mudstone roadbed.
S7, paving a sandy drainage layer on the side slope geogrid to extend to a sandy drainage layer at the lower part of the roadbed, wherein the sandy drainage layer is gradually thinned from inside to outside, covers the grouted rubble and extends to the sandy drainage layer at the bottom of the roadbed, a water collecting pipe is arranged outside the sandy drainage layer at the bottom of the roadbed, dry rubble is paved on the water collecting pipe, and the water collecting pipe is provided with a hydrophobic plate, anti-filtration geotextile and an anti-countercurrent pressure valve;
and S8, arranging a drainage ditch at the part of the external embankment lower than the level of the roadbed. And natural rainfall is converged into the embankment drainage ditch through the pavement side ditch, so that the rainfall is prevented from permeating into the roadbed. The side slope of the roadbed and the sandy drainage layer at the lower part of the roadbed can also drain a small amount of seepage water in the roadbed into the water collecting pipe and the drainage ditch.
The collector pipe has arranged hydrophobic plate, has strained geotechnological cloth, anti-adverse current pressure valve reversely, hydrophobic plate sets up in the collector pipe top, is "eight characters" distribution and collects the flowing water, and cloth has strained geotechnological cloth reversely between hydrophobic plate and the collector pipe.
The collector pipe guarantees through hydrophobic plate and anti-geotechnological cloth that the infiltration flows into the collector pipe smoothly and can not appear blockking up or the condition of cross flow, and anti-reflux pressure valve can guarantee that outside drainage can not flow backwards and get into the collector pipe and cause reverse seepage flow and drainage difficulty.
Example 3:
referring to figures 1 through 4 of the drawings,
a construction method for using red bed mudstone blocks as high-fill dynamic compaction roadbed filling,
the method comprises the following steps:
s1, pre-disintegrating red-layer mudstone, exposing the blasted red sandstone filler in the atmosphere, sunlight and rainwater without covering, watering once a day when the highest temperature of the sunny weather is higher than 30 ℃, watering once every other day when the highest temperature of the sunny weather is lower than 30 ℃, and pre-disintegrating for 8-15 days. The method for judging whether the red layer mudstone is disintegrated is to disintegrate the red sandstone blocks newly by large blocks with the grain diameter of 50-70 cm, after a plurality of days of pre-disintegration treatment, a large number of cracks appear on the surface and most of broken rocks are disintegrated, and when the large blocks are pushed by soles, the large blocks are disintegrated into broken rock piles, namely the disintegration treatment of the red sandstone is considered to be finished.
Under the action of these natural factors, red mudstone is decomposed quickly by weathering, its strength is reduced quickly and its activity is eliminated quickly.
S2, the red sandstone filler after the pre-disintegration treatment can be transported to a embankment for filling, then the dynamic compaction treatment is carried out, the dynamic compaction is firstly carried out for two times, and then the dynamic compaction is carried out for one time.
The processing mode of the step tamps the embankment filler, accelerates the drainage and consolidation of the filler and increases the compactness.
S3, paving a lime-soil cushion layer, uniformly paving the mixed lime-soil with the block diameter smaller than 15mm on the top surface of the embankment, paving a composite geomembrane layer on the lime-soil cushion layer, wherein the paving thickness is smaller than 200mm, and tamping the mixed lime-soil cushion layer by using a road roller or a frog hammer.
This step prevents groundwater from infiltrating the subgrade by capillary action.
S4, paving a sandy drainage layer on the lime cushion layer, gradually reducing sand grains from bottom to top, covering the sandy layer with a small amount of pre-disintegrated red mudstone, flattening by using a bulldozer, and tamping the pre-disintegrated red mudstone by using a dynamic compactor.
Make red bed mud rock filler particles's pore water discharge along sandy drainage bed seepage flow downwards through ramming, filler drainage consolidation process is accelerated, and the soil particles receive the weak water film attenuation that combines in extrusion soil particle surface, and inside microstructure is more closely knit.
S5, after filling of the roadbed, spraying a soil hydrophobing agent on the roadbed side slope and the roadbed top surface, mixing and paving the water-based environment-friendly soil surface hydrophobing agent and red layer mudstone on the roadbed top surface and the side slope surface, and leveling the soil surface sprayed with the hydrophobing agent by using a road roller and a land leveler.
And S6, laying geogrids on the road side slope, and fixing the geogrids on the side slope.
The geogrid and the soil hydrophobing agent jointly form a combined waterproof layer to prevent surface rainfall from permeating into the red layer mudstone roadbed.
S7, paving a sandy drainage layer on the side slope geogrid to extend to the sandy drainage layer at the lower part of the roadbed, wherein the grain diameter is gradually thinned from inside to outside, a concrete framework protection slope with a drainage channel is embedded and extends to the sandy drainage layer at the bottom of the roadbed, and the water collecting pipe is provided with a drainage plate, a reverse filtering geotechnical cloth and a reverse flow prevention pressure valve;
s8, arranging a drainage ditch at the part of the external embankment lower than the road bed elevation. Natural rainfall is converged into the drainage ditch of the embankment through the pavement side ditch, so that the rainfall is prevented from permeating into the roadbed. The side slope of the roadbed and the sandy drainage layer at the lower part of the roadbed can also drain a small amount of seepage water in the roadbed into the water collecting pipe and the drainage ditch.
The collector pipe has arranged hydrophobic plate, has strained geotechnological cloth, anti-adverse current pressure valve reversely, hydrophobic plate sets up in the collector pipe top, is "eight characters" distribution and collects the flowing water, and cloth has strained geotechnological cloth reversely between hydrophobic plate and the collector pipe.
The collector pipe guarantees through hydrophobic plate and anti-geotechnological cloth that the infiltration flows into the collector pipe smoothly and can not appear blockking up or the condition of cross flow, and anti-reflux pressure valve can guarantee that outside drainage can not flow backwards and get into the collector pipe and cause reverse seepage flow and drainage difficulty.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. A construction method for using red bed mudstone blocks as high-fill dynamic compaction roadbed fillers is characterized by comprising the following steps:
s1, performing pre-disintegration treatment on the red-layer mudstone, and exposing the blasted red sandstone filler in the atmosphere, sunlight and rainwater without covering, wherein the total days of the pre-disintegration treatment is 8-15 days;
s2, transporting the red sandstone filler subjected to pre-disintegration treatment to a embankment for filling, then performing dynamic compaction treatment, and performing point compaction twice firstly and full compaction once;
s3, paving a lime soil cushion layer, uniformly paving mixed lime soil with the block diameter smaller than 15mm on the top surface of the embankment, wherein the paving thickness is 150 mm-200 mm, and tamping the lime soil cushion layer by using a road roller or a frog hammer;
s4, paving a sandy drainage layer on the lime-soil cushion layer, gradually reducing sand grains from bottom to top, covering the sandy layer with a small amount of pre-disintegrated red mudstone, rolling by a road roller, and tamping the pre-disintegrated red mudstone by a dynamic compactor;
s5, spraying soil hydrophobing agent on the roadbed side slope and the roadbed top surface after the filling of the roadbed, mixing and paving the water-based environment-friendly soil surface hydrophobing agent and red layer mudstone on the roadbed top surface and the side slope surface, and leveling the soil surface sprayed with the hydrophobing agent by using a road roller and a land leveler;
s6, laying geogrids on the road side slope, and fixing the geogrids on the side slope;
s7, paving the sandy drainage layer on the side slope geogrid to extend to the sandy drainage layer at the lower part of the roadbed, wherein the grain diameter is gradually reduced from inside to outside, the sandy drainage layer covers the grouted rubble and extends to the sandy drainage layer at the bottom of the roadbed, and the outside of the sandy drainage layer at the bottom of the roadbed is provided with a water collecting pipe and is paved with dry rubble;
and S8, arranging a drainage ditch at the part of the external embankment lower than the level of the roadbed.
2. The construction method for the high-fill dynamic compaction roadbed filling by using the red bed mudstone blocks as the claim 1 is characterized in that: the method for judging whether the red layer mudstone is disintegrated in the step S1 is that a large newly disintegrated red sandstone block with the grain diameter of 50-70 cm is subjected to pre-disintegration treatment for a plurality of days, a large number of cracks appear on the surface, most of broken rocks are disintegrated, and when the large rock block is pushed by a sole, the large rock block is disintegrated into a broken rock heap, namely the disintegration treatment of the red sandstone is considered to be finished.
3. The construction method for utilizing the red bed mudstone blocks as the high fill dynamic compaction roadbed filling material according to the claim 1, characterized in that: in step S1, watering is carried out once a day when the temperature is higher than 30 ℃ in sunny days, and watering is carried out once every other day when the temperature is lower than 30 ℃ in sunny days.
4. The construction method for utilizing the red bed mudstone blocks as the high fill dynamic compaction roadbed filling material according to the claim 1, characterized in that: and step S3, laying a composite geomembrane layer on the lime-soil cushion layer.
5. The construction method for the high-fill dynamic compaction roadbed filling by using the red bed mudstone blocks as the claim 1 is characterized in that: in the step S7, the grouted rubble can be replaced by a concrete framework slope with a drainage groove.
6. The construction method of the red bed mudstone block as the high-fill dynamic compaction roadbed filling material according to the claim 1, which is characterized in that: the water collecting pipe is provided with a hydrophobic plate, reversed filter geotechnical cloth and a reverse flow prevention pressure valve, the hydrophobic plate is arranged at the top of the water collecting pipe and distributed in an inverted splayed shape to collect flowing water, and the reversed filter geotechnical cloth is distributed between the hydrophobic plate and the water collecting pipe.
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| CN115029970A (en) * | 2022-06-20 | 2022-09-09 | 交通运输部公路科学研究所 | Automatic anti-seepage access road structure suitable for soft soil foundation of ecological sensitive area and construction method |
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| CN106087627A (en) * | 2016-06-16 | 2016-11-09 | 中交四公局第二工程有限公司 | Red sandstone roadbed filling construction technique |
| CN106049407A (en) * | 2016-06-25 | 2016-10-26 | 中国水利水电第四工程局有限公司 | Foundation dynamic compaction construction method |
| CN111188234A (en) * | 2020-01-10 | 2020-05-22 | 中国十七冶集团有限公司 | Method for enhancing construction quality of red sandstone roadbed |
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